arvind@utcsri.UUCP (11/13/87)
Date: 10 Nov 1987 18:08:04-EST (Tuesday) From: Paul Vitanyi <MCVAX!CWI.NL!PAULV@uunet.uu.net> Subject: NSPACE In the EATCS Bulletin of October 1987 (Number 33), pp. 94-100, there is an article by Robert Szelepcsenyi ``The method of forcing for nondeterministic automata'', claiming the result NSPACE (L(n)) is closed under complement for L(n) >= log n The author refers to an earlier tech rept (in Slovak): ``R. Szelepcsenyi, Context-sensitive languages are closed under complementation, Tech. rept. Komensky University, April 87. The author does not refer Neil Immerman.